I noticed that too Gaspedler.Was there one T-pipe for every underground tank? Also were are the pipes for filling those same tanks? If I was that kid in suspenders ,I'd have those Willard & Pepsi signs on my bed room wall!! Lol. Dave
Yes, there would have been a different vent pipe for each tank.
Fills most likely are located below ground or off to the side of the station out of view.
And the guys are right, most likely there were multiple tanks for the same product. Underground composit would have dictated the size in some areas. In areas with a solid stone formation, smaller tanks in more numberous numbers were used.
This proved to be a problem in later years. The pits to set tanks in stone formations were drilled and blasted with dynomite. If larger tanks or additional tanks were desired later on. Only small enlargements could be made. Because of the risk of a tank leaking and the gas running out into formation, there was a risk of explosion. That explosion could happen over a half mile from the station if the product had run into a pool there.
Having the vent pipes in two areas would be indicative of an addition of more tanks at a later time. Maybe to accomdate the additions of additional brands of gas.